While that Commissar thing may not be all that nice, you could justify it that battle intelligence shows that particular WE to be a Command-and-control vehicle and as such a priority target.  The signal gets sent up (literally) and translates into a hit.
A couple weeks ago I 'sniped' one of three SHTs that were spaced 10cm apart. The shot destroyed the middle SHT and the formation was now out of coherency.  Was that me being beardy or clever?  I would argue the latter.
Ex. You have a Shadowsword and a formation of SHTs in front of you.  A move in one direction places puts a regular SHT in the front, in a sense setting it up for the first hit.  But a move in another direction makes the commissar-held SHT up front.  You do the latter and fire, killing the commissar.  Is that beardy?  No.
If you have two gargants and one has a Supreme Commander and the other doesn't; if a player fires a Deathstrike at the Supreme Commander Gargant, is that beardy?  No.
This is simply a rules mechanic and it isn't even gray; there isn't an English speaking person that can successfully argue the RAW means "formation".  We're not talking about aircraft sniping where the intention was clearly never to allow aircraft to target specific units.  The pin-point rule calls for it explicitly.  With (non-Tau ÂÂ

) spacecraft being an iffy purchase to begin with, I can't imagine this being overpowered at all.
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author of Syncing Forward and other stories...It's a dog-eat-dog world, and I've got my Milkbone underwear on.